Nortli American HelicidcB. 93 



In my Cabinet are specimens, received from Mr. "W. G. 

 Binney, belonging to this species, liaving all the peculiarities 

 of the last whorl, but being rather delicately striated, — they 

 are extremely small, and were, I believe, from Dr. Binney's 

 Cabinet ; the habitat nnknown. The measurements are, 



Diam. maj. 5^, min. 5, Alt. 2 mill. anfr. 5. 



The variety from Lake TIarney is dark horn-colored, thin, 

 translucent, acutely ribbed, but with little of the peculiarities 

 of the last whorl prevailing in the Key Biscayne specimens, 

 and in the small variety already noticed, — the whorl, scarcely 

 flattened and contracted as in those, is nearly of uniform size 

 beneath. 



Several years ago I received from the late Mr. Clark of Cin- 

 cinnati, about a dozen shells of the species now under consider- 

 ation, labelled by Mr. Bartlett "H. septemvolva Say, Matanzas, 

 Cuba," but agreeing with specimens sent to me by Mr. Shuttle- 

 worth as II. rriicrodonta from Key West. I communicated them 

 under the latter name to M. Poey, who seeing that live exam- 

 ples have not been found in Cuba, doubtfully refers the species 

 to the fauna of that island. (Yide Mem. V. 11. p. 49 and 90.) 



This species I dedicate to my friend Mr. P. P. Carpenter, 

 author of the " Report on the Present State of our Knowledge 

 with regard to the Mollusca of the West Coast of North Ame- 

 rica," &c., (fee, whose labors in the United States have added 

 much to the value of many of our public and private cabinets. 



Note.— 11. mickodonta Desh. — With respect to this species, 

 looking at his description, I cannot doubt but that the author 

 refers to the Bermuda shell, now somewhat extensively known 

 in cabinets as H. delitescens Shutt. I should mention that Mr. 

 Shuttleworth, in his latest correspondence with me on the sub- 

 ject, expressed some doubt as to treating the Florida shell as 

 the species described by Deshayes. Those doubts may account 

 for the non-publication of II. delitescens. 



The shells found in abundance by Mr. W. Cooper, at Nassau, 

 agree rather with those from Bermuda than any other. But in 



